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What Does P2251 Code Mean?

    OBD-II Code P2251 is defined as a O2 Sensor Negative Current Control Circuit/Open

    The purpose of the oxygen sensor is to measure the oxygen content in the exhaust gases after they leave the combustion process of the engine. This information is critical to the PCM's ability to maintain efficient fuel economy. When the PCM detects a failure of the sensor or the information received from the sensor, it will set code P2251.

    P2251 Symptoms

    • Decreased engine performance
    • Increased fuel consumption

    Common Problems That Trigger the P2251 Code

    • Exhaust leak
    • Oxygen sensor failure
    • Powertrain Control Module (PCM) failure
    • Wiring issue

    Common Repairs Needed for the P2251 Code

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